circulation zone meaning in English

循环区

Comparison between the numerical results and the measured data shows that it is adequate for the standard k ~ e turbulence model to simulate the complicated flow pattern with the existence of separation and circulation zones
实测流速资料和数值模拟结果表明，所选用的紊流数学模型可很好的模拟出由于丁坝阻隔水流所产生的分离、回流等流动现象。
Through analysis of potential vorticity in equity - entropy surface field , a relatively high potential vorticity center in cyclone top in low - troposphere have discovered , and make cyclone develop in a more deep cyclone circulation by this ; and an anticyclone circulation zone with more severe low potential vorticity in high - troposphere
通过对等熵面的位涡分析，发现了对流层中低层的位涡场，在气旋上方有一个相对高位涡中心，由此使得气旋在一个比较深厚的气旋性环流中发展；而对流层高层则是一个伴有较强位涡低值的反气旋环流区。